Trying to figure out bed configuration

Bought a new trd pro and having some trouble finding a good bed setup.here are the wants:
1. Need to have quick access to a fairly large area for luggage, groceries etc that is out of the weather.
2. Ability to carry tall items like a fridge or similar.
3. A way to carry a mountain bike quickly (am fine throwing it in the bed, I have a trailer mount for longer trips)
4. Won't freeze up in ice/snow conditions
5. Area to store a backpack, various recovery gear so isn't just free floating the bed. A toolbox would work or something like a rubbermaid bin could work. Easy access is key.
6. Ability to get long lumbar from hardware store. I am okay with putting this on a roof rack if needed. But I am not okay with blocking my sunroof.
7. Flexing offroad doesn't through it out of alignment.
8. Is secure.

The diamondback looks awesome for most everything except easy ability to carry tall things with that fixed center section.

The American work cover looks pretty good but I question its durability based on the design and it looks like ice would jam that thing up.

A softtopper combined with roof rack is great for all but security. (I have a softtopper currently).

Ideas?